this is a patch that change generate_rss() function in order to accept a new parameter for the language to use.
The generated RSS file only contains entries in that language.
patch for generating RSS in a translation
There is a function used in the patch called iso639() that does not exist.
It seems iso639() is defined in scripts/sb_language.php
Hmmm, it appears that sb_language.php doesn't exist anymore. See the latest release and svn code.